Transmission device for motor-cycles.



N. CHAMBERS, H. A. MCCDY,` T. G. ANDBRSUNKL C. WEBB. TRANSMISSION DEVICE FCR MoToR CYCLES. APPLICATION FILED NOV. 27,1912.

Lck-@275vv Patented Apr.15,1913

cuLUMBlA PLAMmRAPM CD.. WAaMlNuToN. u. C.

nNiTED i sTATEs PATENT oEEioE.

NEDsON` CHAMBERS,

HENRY 1 ALEXANDER MecoY, THOMAS GILBERT ANDERSON; AND

. i CHARLES WEBB, OEIHAIVIIETON, ONTARIO,ICANADA.1

TRALNSMISSIONI DEVICE FOR MOTORCYCLES.

I To all whom t may concern Be` it known that iwe, NELSON CHAMBERS,

Our inventionrelatesto improvements in transmission devices for motor cycles, `and the obj ect of the invention is to devise a sim-` ple, effective and positive change speed gear.- ing for motor cycles, which can bereadily applied thereto; alfurther object is to `construct a `change speed gearingin which the gears arealways inimesh; a still furtherobject is to devise a` change; :speed gearing,

which can be readilyremoved for repairs.

Our inventionconsists ofi `a slidable shaft extending horizontally of. "the 3 frame ,supf ported in forward bearings; secured toitlie crank caseof the engine, and supported at its rear end in suitable bearings secured` to frame all "as themembers ofi the frame,- the bevel pinion havingI a forwardly extending shank, and rotatably mounted on ball-bearings forward of the rear shaft bearings, the interior of the pinion being 1of1truncated conical` shape, a bevel pinion similarlymounted in the rear A of the rear.. shaftibearings` and having a truncated conical interior set oppositely to the aforesaid interiori of the other bevel pinion, a ldouble` Opposed truncated conical frictioni member ;r1gi1dly secured to the aforesaid shaft, concentricbevel gears secured to the rear wheel andmeshing with aforesaid bevel pinio-ns respectively, said pinions beingnormally independent `of the slidable shaft,` a bevel pinionsuitably se` cured near the'forward end of the slidable shaft and meshing with `the bevel gear sei cured to the `crankshaft/of the engine, a' sleeve having enlarged annularzends and rotatably mounted oniball-bearings lon the forward end of the slidable` shaft, a control lever pivotallymounted onthecrank case 4of the engine,and `having a forked lolwer end designed to extend around. `the aforesaid sleeve, `the `upper end oflthe lever being` provided "witlr a suitable pawl `designed to engage a racksecured to the cross bar of the Specification of Letters Patent.

all of hereinafter more particularly Patenteimpr.115,191e;`

Applicationiled November 27, 1912i. Serial No. 733,812.

described `and illustrated in the accompany- Figure 1 represents an elevation of `rear portion ofthe motor cycle showing `our de-` vice applied thereto. Fig. 2 is a horizontal section of the change speed gearing. Fig.; 3

a verticalsection of the sleeve mounted on the forward ;end of the slidable shaft. Fig. 4 is a zvertical section of analternative form of frictionmember. Fig. 5 is across section thereof.` Fig. y 6 change speed gearing and slidable shaft showing the latter provided with a universal` Joint.` y

Like `characters Of reference indicate correspondingparts in the different views.

1 is the rear wheel of the motor cycle.l

2 is the frame upon which the wheel is 1 mounted? i 3 is the motor cycle engine, 4 is the crank case thereofr is a detail Of the` 5 is the slidable shaft suitably mounted in forwardbearings 6 and 7 at `its forward end .i and in bearings 8 and 9 at itsrear end,` said rear bearings being suitably secured to the frame 2by `the bracket pieces 10 and 11.;

12 is the `forward bevel pinion `of the i change speed gear, said pinion liavingthe truncated conical interior 13 and a for-1` wardly extendingshankll upon which are mountedlremovable ball` cups 15 and 16.`

The forward end of the shank is reduced and threaded. The nut 17; is threaded thereon for holdingthe ball cups'in place, saidvn'ut beingalso `provided with a lock washer `18. The balli race 19 is inserted into the bearings 8, being Temovably secured thereto. Balls 2O are introduced into t ie space between the i ballraces and ball cups in` the manner well known.

21 is the high speed bevel pinioin; the pinion 12 being the low speed pinion andl saidpinion 21, having `an oppositely truncated conical interior 21 to the interiorl of the pinion 12 and also having a rearwardly extending ed on `the bearing 9 in the identical manner to that described for thelow speed pinion `12.

23 is the double opposed truncated conical friction member having the conical faces i shank 22, which is mount- 24 and 25 respectively, said frictioninember being; constructed of `any suitable material,` and being provided with a sleeve 26 having a threaded lend upon which a nut27 screwed in order that the friction member may beremoved when desired. The said" member itis keyed to thevslidableshaft fand is designed toslide therewit'hfso'that'the.

conical face 24 comes into enga-gement with the conical interior'l"`A of the pinM ion 12 when ,the shaft is slid forwardly andV the kconical face 25'comes`. in! engagement with the conical interior 21a ofthevhigh speed pinion 21 when shaft'is Aslid rear-QVW warclly., I l. l, y Y t Sand 29 are concentric bevel gears suit# ably securedto the rearwheel l, theV gear being.. the larger "andl 'meshingvlwith the aforesaid pinion 12- Y p15 the bevelV pinion suitably secured-v to thefslidable'shaft'near the forward end of the same and meshing withthebevel gear 31 secured tothe crankshaft of the engine.

32'isA the sleeve having' enlarged 4annular ends 33 said sleeve being'` rotatably vmounted n the'reduced forwardend y5a of the shaft ball-bearings, 34'"Y which i, bear against' th'eb'alf race 35 formed onfthe 'interior `of the sleeve and against ballfcups 36 mounted on'thereducedfend 5a, `and retained in placelbythef lock'washe'r 37l and the nuts 38, thelatterfofwhich are threaded on the reduced' end.

Sisa control lever pivotallyconnected to`- the crank ease 4" and having aA forked lower end designed to surround thesleeve 32.

410,7,fis `theracksecured .to the crossv ybarl 2` the frame, and said lever being'` designed teilgage theteeth' of the, rack.

In the alternativeconstruction of the frictionfmeniberjjshownin Figs. 4: and 5,41 is afriction'zmember lrigidly mounted on the f shaft" 5 and bein-'gef truncated `conical shape,

AIn Fig. 6 a vuniversal joint 45 is used onv Theoperation ofthe device is as followszi-It is to-be'assumed that the part 255 is" in ay neutral'positi'on as shown inFig. 1.

Wh'enrit is desired to throwy the gearing into low?l speed relation, the operator simply pulls blacky thelever 38X, which movesthe sl'id'a-ble shaft forward, and also the friction member'i23'; which is secured thereto, until the conical surfacev thereof comes into engage` mehr with .the interior 13 of the pinion 12 thepinion being inmesh with the bevel gear28, the cyclev moves forward on low speed.y l:When suflicient momentum' has been i attained, and it is desiredto changel into high'` speed, it isA only necessary to push `the lever forward' which in turn slidesV the shaft -5V into rthe rearward directionand conse,-k quent'ly the friction member 231,*thus brings,

imeshes with"the1smaller lbevel gear 29 thus fmoving Athe cycle forward on high speed.

1is:adapted tobe locked in any position. i

` jAs many*` modifications maybe made in' v ,the device without departingfrom the spirit` of the invention or thej scope ofthe'` claims,"

the form shown is'lto be t-a ving the conicalgfaceA 25 linto engagement with y the interior 21a. of [the` pinionv .21', vfwhich' ken' in illus-- trative, and `not'in' a 4 limitingfsense. i For y,

linstance, we do`not"wish` to'con fi,ne ourselves vto the forni' of particular friction z'mein'ber shown asf the members shown in"y the: modiii-V cation orin factany' suitable member could] be used'in' place thereof. 7

i what We' do' @lamas our revenues; and desire' t'o secure by Letters Patent, is-vl' l. Atransmission device for motor cycles i comprising "concentric high and yl'ow speed bevelv gears suitably'l secured tfthe'rear l wheel, independentl fand lew'speed pin.-4 ions meshing respectivelyfwith the high' and lo-w speed' gears, af slidable'shaft mounted in suitablebearings and extending through the pinions, la gear on the'crank' shaft of the I;

engine, a pinion suitably secured to they slid"-` fy ableshaft nearpitsforwardV end', said pinion meshing with the crankshaft gear,"iA ,fric# tion memberv keyedtothe rear 'entf of the shaft, andmeans forsli'dingthe shaft-for-v i i wardly and rearwardly rfor b'ringin;` the` f faction member inte-engagement with the. lowk and high vspeed pinion's* respect` ively;

Atransmis'sionl devicef for motorA cycles' comprising concentric high and/low1A speed bevel gears :suitably seiiured.v tol rear wl'1`fee l,'l;l f v independent vhigh and low 'speed pinions,

said` pinions'` havingg,y oppositely disposed` truncated conicalV shaped interiors, a slidi-l able shaftmountedlin suitable bearings andV l, i

extending' through" the vvpi the crank shaft lofthe engine, a pini'onslid? ably keyed tothe sli'd'ab'le shaft, near its 'forward end, said kpinion meshing k,with the crank shaft gearpa; double', opposed `trin= nions, a l gear -on cated. conicall friction member'keyed toth'e .y

rear end of the shaft and `means for sliding the shaft and friction n'ie'mber forwardly' and rearwardly for bringingthe conical surfaces J of the friction member with the `low V spectively.

comprising concentric high and" low speedv i intoy engagement t and 'high'rspeed'fpinions re-L] n Y 3. A transmission deviceformotor cycles bevel gears suitablyA secured to thev'rear wheel, independent high' low speed pini' ions said pinio'ns having oppositelydisposed truncated conical rshaped interiors,fa slidable shaft "mounted in'suita'ble bearings'v andk eXtending through'v the pin1ons,',a gear on the crank shaft of the'gei-ig'ine` apinion slidl 'ably keyedto thel slid'a'ble shaft, near its opposed truncated conical friction `member keyed to the rear end of the shaft, asleeve `having jen-` larged annular ends rotatably mounted on the forward end of the slidable shaft, and a pivoted controlleverlhaving a forked lower end adapted to extend around the aforesaid sleeve.

4. In a transmission `device for motor cycles, the combination lwith the slidable shaft and rear bearinofs, of high and low speed pinions having lollow interiors and Shanks with threaded outer ends extending through the bearings, removable ball cups mounted on the shanks,1balls, ball races removably inserted within the bearings and secured thereto, a friction member keyed on the slidable shaft and nuts `threaded in the Shanks for holding `the pinions in place.

5. In a transmission device for motor cycles, shaft and rear bearings, of `high and low speed pinions, having` hollow interiors, of truncated conical shape, 1the conical interior of the high speed pinion being reversed to the combination `with the slidable the conical interior of the low speed pinion,` andishanks `with threaded outer ends eXtend-; i ingl throughz the bearings, removable `ball cups mounted on the Shanks, balls, ball races i removably inserted within the bearings and secured thereto, a frictionimember keyed to the slidableishaft and nuts threaded on the n Shanks for holding the pinions in place.

6. In` a `transmission device for motor cycles, the combination with the slidable shaft,` ofa isleeve having enlarged annular ends, andball races formed in the interior thereof, balls, ball cups mounted on the shaft and nuts threaded on shaft for holding `the sleeve on the same.

In witnesswhereof wehave hereunto setour hands `in the presence of two witnesses.

NELSON CHAMBERS.

HENRY ALEXANDER MCCOY. THOMAS GILBERT ANDERSON. CHARLES WEER Vitnesses MURIEL BRAVIN, RCHARDJUTLER.

Copies of this patentmay ne obtained for five cents each, by `addressing the` Commissioner of Patents,

` Washington, D. C.

the end of the 40 

